Algebraic Approximation: A Guide to Past and Current Solutions

ISBN-13: 9783034801935 / Angielski / Miękka / 2011 / 205 str.

Jorge Bustamante

Opis

This book contains an exposition of several results related with direct and converse theorems in the theory of approximation by algebraic polynomials in a finite interval. In addition, some facts concerning trigonometric approximation that are necessary for motivation and comparisons are included. The selection of papers that are referenced and discussed document some trends in polynomial approximation from the 1950s to the present day.

Recenzje

From the reviews:

"This book is a survey of several topics in algebraic polynomial approximation on a finite interval, mostly related to the degree of approximation. ... The book can be of great help to researchers, both those taking their first steps in the subject and veteran researchers who need to check references." (D. Leviatan, Mathematical Reviews, September, 2013)

"The monograph presents an exposition of results related to direct and converse theorems in the theory of approximation by algebraic polynomials in a finite interval. ... The main achievement of the book is that it gathers some different known solutions to problems in algebraic approximation that are not collected in other text books. ... this book is a very helpful tool for students and researchers interested in approximation by algebraic polynomials." (Daniel Cárdenas-Morales, Zentralblatt MATH, Vol. 1248, 2012)

Spis treści

Preface.- 1 Some Notes on Trigonometric Approximation.- Early years.- Direct and converse results: a motivation.- Some asymptotic results.- 2 The End Points Effect.- Two different problems.- Nikolskii’s discovery.- Problems connected with Nikolskii’s result.- Timan-type estimates.- Estimates with higher-order moduli.- Gopengauz-Teliakovskii-type estimates.- Characterization of some classes of functions.- Simultaneous approximation.- Zamansky-type estimates.- Fuksman-Potapov solution to the second problem.- Integral metrics.- Lp, 0 < p < 1.- TheWhitney theorem.- Other classes of functions.- 3 Looking for New Moduli.- The works of Potapov.- Butzer and the method of Fourier transforms.- The τ modulus of Ivanov.- Ditzian-Totik moduli.- Felten modulus.- 4 Exact Estimates and Asymptotics.- Asymptotics for Lip1(M,[−1,1].- Estimates for Wr.- Asymptotics for Cr,w[−1,1].- Estimates for integrable functions.- Pointwise asymptotics.- 5 Construction of Special Operators.- Estimates in norm.- Timan-type estimates.- Gopengauz estimates.- Bernstein interpolation process.- Integral operators.- Simultaneous approximation.- Estimation with constants.- The boolean sums approach.- Discrete operators.- Bibliography.- Index.

Blurb

This book presents a unique survey of solutions in algebraic approximation. Several results related with direct and converse theorems in the theory of approximation by algebraic polynomials in a finite interval are discussed. Some of these results are not collected in any other book. In addition, facts concerning trigonometric approximation that are necessary for motivation and comparisons are included. The selection of papers that are referenced and discussed document trends in polynomial approximation from the 1950s to the present day.

 

Algebraic Approximation: A Guide to Past and Current Solutions will be invaluable to anyone seeking to understand the evolution of ideas in algebraic approximation. Its extensive bibliographic character will help finding the correct references for a specific result.